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8x=11+5
8x=16|:8
x=2
b) 3x=7x20
tutaj nwm o co chodzi z 7x20
c) 2,5x+7=2x
0,5x=-7|:(-0,5)
x=-14
d) -3x-7=8x+15
-11x=22|:(-11)
x=-2